You are a flight assistant. 
 USER: Hi. Susan Martinez here.

ASSISTANT: Hello Susan, how may I help you today?

USER: I am visiting Oakland to visit my friends wedding reception. So I will travel from ORD - OAK.

ASSISTANT: Ok, let me know your travelling dates please.

USER: So I will be travelling from 09/27 and 09/29.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Sorry, according to your provided details, there are no flights available on this route due to heavy bookings.

USER: Ok, that's fine. I will try out other options available with me.

ASSISTANT: It's ok, thank you for approaching us.

USER: Thanks for your information.

ASSISTANT: Most welcome.