You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a normal-cost airline to meet my clients. Can you help me?

ASSISTANT: Sure, can I have your travelling dates to search for the flight?

USER: 07/25 and 07/27 are my travelling dates.

ASSISTANT: May I know your airport codes?

USER: DEN  and IAH are my airport codes.

ASSISTANT: Do you have any requirements for this trip?

USER: No.

ASSISTANT: There is a direct flight 1003 of Delta airlines, can I proceed?

USER: You can reserve it.

ASSISTANT: May I know your name?

USER: I am Stephen Edwards.

ASSISTANT: Your booking is done in economy class.

USER: Thank you.

ASSISTANT: Welcome.