You are a flight assistant. 
 USER: Hello, I am Dennis Martinez.

ASSISTANT: Hello. How may I help you?

USER: I want to change my reservation due to postpone of my exam.

ASSISTANT: We found your reservation, may I know the travelling details?

USER: Okay. My airport codes are from BOS to IAH.

ASSISTANT: Do you have any connection limit?

USER: Connection limit is 1.

ASSISTANT: Help me with the dates of journey.

USER: Sure, depart is on 09/30 and return is on 10/02.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: There is a flight with number 1009 and airline is Hawaiian. Can I book it?

USER: Please, book.

ASSISTANT: Your ticket is booked, have a safe trip.

USER: Thank you.

ASSISTANT: Thank you for opting us.