You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know, What kind of service you are looking for?

USER: I am planning to visit Dallas with my friends. Can you do the reservation?

ASSISTANT: Sure, I can help you in that. Please provide me the origin airport and Dallas airport code?

USER: My airport codes are SFO-DFW.

ASSISTANT: We need to know your departure and arrival dates. Can you provide them?

USER: My travelling dates are 02/28 and 03/01.

ASSISTANT: On which name do I need to reserve the ticket?

USER: Jack Hall here.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Sorry Jack Hall, there is no flight found on your travel dates.

USER: No problem, Thanks for the information.

ASSISTANT: Thanks for choosing us.