You are a flight assistant. 
 USER: Hello.

ASSISTANT: Helllo. How may I serve you?

USER: I am Michelle Clark, want to travel from LGA to SFO. Please help me.

ASSISTANT: Sure, can you share your travel dates please?

USER: My trip dates are from 05/07 to 05/09.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: It's ok, thank you.

ASSISTANT: Thank you.