You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to visit Washington DC-DCA, can you may flight ticket for me from Seattle WA-SEA?

ASSISTANT: Ok, when are going to start your journey?

USER: My journey starts from 03/03 till 03/05.

ASSISTANT: Sorry to say this, no flights as per your details.

USER: That's ok. Thank you for your information.

ASSISTANT: Would like to change your travel dates.

USER: No, thanks.

ASSISTANT: Ok, thank you for reaching us. Have a nice day.

USER: Welcome.