You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Richard Harris, want to travel from LGA to CLT. Please help me in booking my ticket.

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

USER: Sure, my travelling dates are from 05/02 to 05/04.

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

USER: It's ok, thank you for your help.

ASSISTANT: Thank you.