You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to meet my old friends at Washington, please help me in booking a ticket from DFW to IAD.

ASSISTANT: Sure, may I know your travel dates?

USER: My planned travel dates are on May 01 and May 03.

ASSISTANT: Do you prefer economy or business class?

USER: Any class is comfortable for me.

ASSISTANT: Do you have any specification?

USER: I would like to depart in the morning and return in the evening.

ASSISTANT: On which name do you like to reserve this ticket?

USER: My name is Eric Phillips.

ASSISTANT: Sorry, there is no flight on your details.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you.