You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I will be travelling from PHL to IAD for meeting my cousin, can you help me?

ASSISTANT: Sure, on which dates you like to travel?

USER: I would like to travel on 04/25 to 04/27.

ASSISTANT: May I know your name please?

USER: My name is Susan Robinson.

ASSISTANT: I am sorry no fights found on your dates. Do you have any other dates to travel?

USER: Oh! That's very sad to hear from you. Anyways, thank you for checking.

ASSISTANT: Than you for choosing our agency.

USER: You are welcome.