You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Myself Donna Baker. I want to visit Downtown Aquarium at Houston, can you please help me in booking a ticket?

ASSISTANT: Sure, may I know your dates of journey please?

USER: Sure, I would like to travel on 02/18 to 02/20.

ASSISTANT: Can I know your airport codes?

USER: My airport codes are from OAK to IAH.

ASSISTANT: Sorry Baker, I did not find any flight basing on your details.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for reaching us.