You are a flight assistant. 
 USER: Hello, I am Helen Smith from Dallas.

ASSISTANT: Hello, How can I assist you?

USER: I want to book a flight ticket to Houston, TX - IAH as I need to submit my research record. Can you please aid me for booking from my hometown?

ASSISTANT: Sure, May I know the source code?

USER: Sure, it is TX - DFW.

ASSISTANT: Please help me with your travel dates.

USER: Sure, I am travelling to Houston on 03/09 and return to my hometown on 03/11.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's Ok, I will choose another alternative to go. Thank you.

ASSISTANT: Thank you for choosing us.