You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Christine Brown here.

ASSISTANT: How may I help you?

USER: I am looking for a flight ticket with price below 1000. Can you reserve the flight ticket?

ASSISTANT: Sure. Please provide your travel codes.

USER: My preferable dates for travel are 01/15 to 01/17.

ASSISTANT: Please provide travel codes.

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

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thanks.