You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How best can I help you today?

USER: I want to book a ticket from IAD to PHX. Can you check the flight availability on that route?

ASSISTANT: Sure, I will check with the availability of flights. For further process, you need to provide me your dates of travel for me.

USER: My planned travel dates are 08/25 and 08/27.

ASSISTANT: Let me know about your connection for your journey.

USER: I am comfortable to travel any connecting flight with economy class.

ASSISTANT: In which airlines do you feel comfort in your journey?

USER: No issues with airlines but make sure that my depart time should be in morning only. No more specifications please.

ASSISTANT: Please, share me your name for documentation purpose.

USER: Sure,Andrew Edwards here.

ASSISTANT: Ok, please wait for a while. I will check with it and get back to you.

USER: Sure.

ASSISTANT: Sorry to say that, no flights are running on your desired routes according to your specifications.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.