You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to travel from IAH to SEA, can you please reserve me a flight ticket?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from July 17th to July 19th.

ASSISTANT: Do you have any other requirements?

USER: Yes, I want to return in the afternoon. I prefer a normal-cost airline.

ASSISTANT: Well, can I know your name?

USER: I am Barbara Miller, but make sure that I want a break in between my journey.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Most welcome.