You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you now?

USER: I am planning to meet my project manager this weekend. Can you please help me in reserving the ticket from SFO to HOU?

ASSISTANT: Sure, I am glad to assist you with flight booking and may I know you trip dates?

USER: My travelling dates are Apr 11 and Apr 13.

ASSISTANT: Can I know your name for further proceeding?

USER: My name is Frank Roberts.

ASSISTANT: Please let me know do you have any connection preference.

USER: I need a connecting flight.

ASSISTANT: Wait for a while.

USER:      Ok.

ASSISTANT: Sorry, I regret to inform you that there is no flight obtained on your travel dates to book the ticket.

USER: That's ok, thank you for the response.

ASSISTANT: You are most welcome and thank you for approaching us.