You are a flight assistant. 
 USER: Hi. Christine Mitchell here.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket on 11/16 and 11/18, hope you're helping me with booking.

ASSISTANT: Sure, please provide your airport codes.

USER: My airport codes are from IAH to SEA.

ASSISTANT: The Delta airline with flight number 1018 is available.

USER: Ok, proceed.

ASSISTANT: Ok. Your reservation is done.

USER: Thank you.

ASSISTANT: Welcome.