You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Richard Nelson here, I want to reserve my ticket from IAH to SFO, can you please help me out?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: Sure, my preferable dates of journey are from Aug, 06 to Aug, 08.

ASSISTANT: May I know your class and airline preference please?

USER: Yes, I need a economy class.

ASSISTANT: Please let me know if you have any other specifications.

USER: Yes, I need a return time at afternoon.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Sorry ton inform you that there are no flights available for you on those dates.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for choosing us.