You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to travel from IAD to IAH. Can you please help me with the booking?

ASSISTANT: Sure, let me know your trip dates please?

USER: Sure, I want to travel from Apr 1 and need to return on Apr 3.

ASSISTANT: May I know your connection limit?

USER: I am looking for a flight with single connection.

ASSISTANT: Do you need any other preference?

USER: I prefer an economy class to travel.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

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

ASSISTANT: Can I know your name please?

USER: My name is Jason Martinez.

ASSISTANT: Thanks for contacting us.

USER: Thank you.