You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Helen Harris.

ASSISTANT: What kind of help do you expect from us?

USER:  I am going for a Grand Canyon Adventure at San Francisco so, can you avail me flight ticket?

ASSISTANT: Sure, we are happy to help you.

USER: Thank you.

ASSISTANT: When are you planning to go to San Francisco?

USER: I want to travel on 05/19, and need to catch return flight on 05/21.

ASSISTANT: Ok, may I know your selected airports to search a flight for you?

USER:  I need to leave from my nearest airport SEA to reach SFO.

ASSISTANT: Thank you for your details, currently all flights are very busy by the specified dates.

USER: Ok, I will try it on another day. Thanks for the information.

ASSISTANT: Ok, hope we serve you next time. Thank you for reaching us.