You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Michelle Carter.

ASSISTANT: How may I assist you today?

USER: I will be travelling to Washington for my health checkup, can you help me?

ASSISTANT: Sure, can you please provide your health checkup travel dates?

USER: 07/26th to 07/28th are my travel dates.

ASSISTANT: May I know the exactly airport code of Washington and from which city you want to travel?

USER: My airport codes are from ORD to IAD.

ASSISTANT: Sorry Carter, there is no flight available with your dates.

USER: No issues. Thank you for checking.

ASSISTANT: Thanks for contacting us, have a great day.

USER: You are welcome.