You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Charles Mitchell.

ASSISTANT: How can I aid you?

USER: I need to visit Houston to give presentation so please help me with flight ticket booking from Dallas.

ASSISTANT: Ok, I will assist you, Can I know your travel airport codes?

USER: Thank you, I would like to travel from DFW to IAH.

ASSISTANT: Ok, may I know your travel dates too?

USER: Sure, I need to travel on dates of 11/08 and 11/10.

ASSISTANT: Please wait a moment please.

USER: Sure, take your time.

ASSISTANT: Sorry Charles, according to location you have provided there are no flights available.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing our agency.

USER: Welcome.