You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Sandra Gonzalez from Dallas.

ASSISTANT: How may I help you?

USER: I have to attend a business meeting in San Francisco next week. Can you please help me in flight ticket booking process?

ASSISTANT: Yes sure, may I know your airport codes?

USER: Thank you for your positive response, I want to fly from DFW and destination airport is SFO.

ASSISTANT: On which dates you are willing to travel?

USER: I want to take off on 08/09 and please confirm my return ticket also on 08/11.

ASSISTANT: Sorry, on these dates no flights are available.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Most welcome.