You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you at this moment?

USER: I am Nicholas Davis here, I want to reserve my ticket from PHL to HOU, can you please help me?

ASSISTANT: Surely, I will help you. Can I have your preferable dates of journey?

USER: Sure, my preferable dates of journey is from 02/07 to 02/09.

ASSISTANT: Can I have a moment please? I will check the availability.

USER: Sure, I will wait.

ASSISTANT: Sorry, there is no flight available on your required dates.

USER: Ok, no problem. I will try with the another booking agency.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Thank you for your service.