You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Daniel Nelson here.

ASSISTANT: Daniel, how can I help you?

USER: Can you book a connecting flight to Phoenix for my business trip?

ASSISTANT: Sure, I am at your service to help you.Can you please provide your planned dates?

USER: My travelling dates for journey are 05/21 to 05/23. My price limit is less than 5000.

ASSISTANT:  Could you please provide the source and the destination airport codes?

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

ASSISTANT: Ok, please hold on for a moment.

USER: Sure.

ASSISTANT: I am sorry to inform you that there is no flight available at your requested dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: You are welcome.