You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to book a ticket from IAH to SEA. Could you book a ticket?

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

USER: Depart is by Oct, 17 and return date is Oct, 19.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart in the afternoon and would like to return in the morning time.

ASSISTANT: Please help me with your name for booking.

USER: My name is Joshua Lee.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Thank you.

ASSISTANT: Thank you for reaching us.