You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: John Carter here.

ASSISTANT: Ok.

USER: I would like to book a ticket from IAH to JFK, can you please help me with that?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: The travel dates are from 01/10 to 01/12.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

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

ASSISTANT: Welcome, have a great day.