You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need your help to book a flight ticket from IAH to SFO.

ASSISTANT: Can you mention your trip dates?

USER: May 20 and 22 my planned travel dates.

ASSISTANT: Is there any connection limit?

USER: I prefer to fly in a economy class. With a break in my journey.

ASSISTANT: Ok, are there any other preferences?

USER: Nothing much to state.

ASSISTANT: May I know your name?

USER: My name is Donald Gonzalez.

ASSISTANT: Sorry to say that, there is no flight found with your details.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.