You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Pamela Miller here.

ASSISTANT: How can I help you today?

USER: I am looking for a flight ticket at a price below 500. Can you book it?

ASSISTANT: Sure, I will help you in booking. Can I have your travelling airport codes please?

USER: Ok. My airport codes for boarding the flight are IAH to BOS.

ASSISTANT: On which dates you want me to book your tickets?

USER: My preferable dates for travel are 03/08 to 03/10.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no flights are available on your route.

USER: I was hoping for a flight as I am your regular customer. Ok, Not a problem. Thank you.

ASSISTANT: Welcome, thank you for reaching us.