You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Melissa Nelson.

ASSISTANT: Melissa, how may I help you today?

USER: As I need to attend my sister wedding, I want to fly from PHX to LAS. Can you help me?

ASSISTANT: Sure, I will help you. Can you please tell me the preferable dates of your journey?

USER: My journey dates are 10/19 to 10/21.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting Melissa, there no flights found on your requirement.

USER: No issue.

ASSISTANT: Do you have any other dates to travel?

USER: Thank you for your time. No.

ASSISTANT: Thank you, have a nice day.