You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Clark here.

ASSISTANT: How can I help you today?

USER: I want to book a flight ticket from Washington. Could you please help me with booking a flight ticket from IAD TO PHX?

ASSISTANT: Sure Clark, I am here to help you to book a flight ticket. Can you please share me your travelling dates?

USER: My travelling dates are from 08/13 to 08/15.

ASSISTANT: Please allow me a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry, no flights are available on your route.

USER: Not a problem, thank you for your information.

ASSISTANT: Welcome, have a nice day.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.