You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Angela Robinson.

ASSISTANT: How can I help you at this moment?

USER: I have a business meeting at Francisco this month. Can you please help me in reserving the ticket from IAH to SFO?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: I am planning to leave on July 25th and again I will return back on July 27th.

ASSISTANT: Is there any additional preferences do you have?

USER: I am flexible with single connection flight.

ASSISTANT: Ok, please hold on a moment, I will check flight availability in this route. If you have any another specifications please feel free to reach us.

USER: Ok, I will wait for your kind response.

ASSISTANT: Sorry no flights are available in this route as per your requested dates.

USER: Not a big deal, anyway thank you very much for your service.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.