You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Evening.

USER: Good Evening.

ASSISTANT: How may I abet you today?

USER: My friend is admitted in San Francisco International Hospital. So, I want to go there to meet her.

ASSISTANT:  Ok, may I know your nearest airport code and if you know about your destination airport code, then please let me know?

USER: My current location is Chicago and my nearest airport code is IL- ORD. Yes, I know my destination airport code that is SFO.

ASSISTANT: Ok, on which date you are willing to move from Chicago?

USER: I have planned to move on 08/18.

ASSISTANT: Ok, may I know if you like to book your return ticket?

USER: Yes, I also want to book my return ticket on 08/20.

ASSISTANT: Ok, please stay online, I will check if there is any ticket available on your provided dates or not.

USER: Sure, take your time. I will be online.

ASSISTANT: May I know your good name please?

USER: Myself Ruth Edwards.

ASSISTANT: Sorry Edwards, there is no ticket available on this route because of festival season.

USER: Oh! That's fine, not an issue.

ASSISTANT: Would you like to change your travelling dates?

USER: No, I don't want to change my travelling dates because it's urgent to go to San Francisco.

ASSISTANT: Sorry for the inconvenience but there is no flight available.

USER: It's ok, I will choose another agent agency for my ticket booking.

ASSISTANT: Ok, thank you for approaching us.

USER: It's my pleasure to use your service.