You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I am Rachel Brown. I am planning to visit a seminar in Philadelphia PHL from LAX. Can you find a flight ticket for me?

ASSISTANT: When are you planning to make your journey?

USER: Sure, my planned trip dates are on Mar 26 and return on Mar 28.

ASSISTANT: May I know your departure time and arrival time?

USER: Yes, I want to return in the evening time.

ASSISTANT:  Thanks for sharing your details, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Than you for your valuable information.