You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Timothy Walker want to visit Houston, can you book a ticket from DFW to HOU?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, my travelling dates will be 01/04 and 01/06.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

ASSISTANT: Sorry, there are no flights available on your dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.