You are a flight assistant. 
 USER: Hello, I am Helen Evans here.

ASSISTANT: Hello. How may I assist you today?

USER: Looking for a flight ticket from ORD to IAD, can you please help me? I want to travel the dates 09/05 to 09/07.

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Based on your request, I cannot find any flight.

USER: Ok, thank you for your service.

ASSISTANT: Sorry for this inconvenience.

USER: No 9issues.

ASSISTANT: It's my pleasure.