You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I want to meet my friend at IAH, can you please help me in booking a flight ticket from HOU?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are from Apr 27th to Apr 29th.

ASSISTANT: Can I know your name please?

USER: I am Sarah Lewis.

ASSISTANT: Do you need any specifications?

USER: I want to return in the morning. I want a stopover in between my journey.

ASSISTANT: Sorry, there are no flights found.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.