You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name?

USER: Yes, my name is Rebecca Garcia.

ASSISTANT: How may I serve you today?

USER: I am looking for booking a ticket from IAH to LAS, can you please help me?

ASSISTANT: Sure, may I know your travelling days?

USER: I prefer to travel on 06/22 and 06/24.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for your valuable time, unfortunately there are no flights found  by the required  dates.

USER: Ok, no issues, I will look for an alternative.

ASSISTANT: Thank you for opting us.

USER: Thank you for your support.