You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for today?

USER: I'm Christopher Mitchell. I am looking for a direct flight, can you find me a direct flight?

ASSISTANT: Yes, I will try for my best. Can I know your nearest airport codes?

USER: I am planning to visit Lake Merritt near OAK , travelling from IAH.

ASSISTANT: Ok, can I know your travelling dates?

USER: I would like to take off on 08/26 and return on 08/28.

ASSISTANT: Ok, give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight found matching your requirement.

USER: That's ok, I will find an another alternate way to complete my trip.

ASSISTANT: Sorry for the inconvenience provided.

USER: Anyways, thank you for the information.

ASSISTANT: Welcome.