You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how could I serve you?

USER: I want to take my children to Houston Zoo on this weekend. So can you book a ticket for me?

ASSISTANT: Sure, To book a flight ticket may I know your travelling details?

USER: OK, my origin and destination airport codes are NY - EWR and TX - IAH.

ASSISTANT: Can you please provide me your departure and arrival dates?

USER: My dates are as 11/15 and 11/17.

ASSISTANT: To proceed further can you please tell me your name?

USER: I am Brenda Brown.

ASSISTANT: Please wait a minute, I will check and let you know.

USER: OK.

ASSISTANT: Sorry to notify you, unfortunately no flight found on your matching details.

USER: OK, thank you for your time.

ASSISTANT: Thanks for choosing us.