You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me to book flight ticket from IAH to SEA?

ASSISTANT: Sure, I am here to help you. Kindly mention your planned travelling dates to proceed further.

USER: My trip dates Oct 30 and Nov 1.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I would like to travel in a connecting flight.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: No, I do not have any other preferences.

ASSISTANT: To proceed  further, can I have your name please?

USER: I am Stephen Mitchell.

ASSISTANT: Thank you for providing your journey details, please wait a moment I'll search best flight for you.

USER: Sure.

ASSISTANT: Thank you for being patient, we didn't find any flights which matches your requirement.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.